Shared Projects by johnsondavies

Shared Projects by johnsondavies

Lisp Badge

2 layer board of 4.20 x 2.40 inches (106.7 x 61.0 mm)
Uploaded: November 28, 2018
Shared: January 10, 2019
Total Price: $50.40

A handheld computer with a self-contained keyboard and display that you can program in Lisp.

See: <http://www.technoblogy.com/show?2AEE>.

A handheld computer with a self-contained keyboard and display that you can program in Lisp.

See: <http://www.technoblogy.com/show?2AEE>.

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Continuity Tester

2 layer board of 1.75 x 0.40 inches (44.4 x 10.2 mm)
Uploaded: November 13, 2017
Shared: November 30, 2018
Total Price: $3.50

This article describes a simple continuity tester, based on an ATtiny85 and a piezo buzzer, designed for checking circuit wiring, or tracing out the tracks on a PCB.

It has a low threshold resistance of 50Ω to avoid false positives, and passes less than 0.1mA through the circuit under test, to…

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This article describes a simple continuity tester, based on an ATtiny85 and a piezo buzzer, designed for checking circuit wiring, or tracing out the tracks on a PCB.

It has a low threshold resistance of 50Ω to avoid false positives, and passes less than 0.1mA through the circuit under test, to…

Show full description

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I2C GPS Module

2 layer board of 0.85 x 1.25 inches (21.6 x 31.8 mm)
Uploaded: November 05, 2018
Shared: November 15, 2018
Total Price: $5.30

A compact GPS module with an I2C interface, making it easy to read the GPS parameters from another project without needing to worry about parsing the NMEA sentences. It's based on an ATtiny841 and a GTPA010 GPS module.

See <http://www.technoblogy.com/show?2C86>.

A compact GPS module with an I2C interface, making it easy to read the GPS parameters from another project without needing to worry about parsing the NMEA sentences. It's based on an ATtiny841 and a GTPA010 GPS module.

See <http://www.technoblogy.com/show?2C86>.

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Tiny Machine-Code Monitor

2 layer board of 1.90 x 2.40 inches (48.3 x 61.0 mm)
Uploaded: July 18, 2018
Shared: July 18, 2018
Total Price: $22.80

A machine-code monitor that you program from a hexadecimal keypad using a simplified machine code called MINIL. MINIL is designed to be easy to understand, so it's ideal for learning about the fundamentals of machine code.

See <http://www.technoblogy.com/show?283C>.

A machine-code monitor that you program from a hexadecimal keypad using a simplified machine code called MINIL. MINIL is designed to be easy to understand, so it's ideal for learning about the fundamentals of machine code.

See <http://www.technoblogy.com/show?283C>.

Embeddable link to order this shared Project

Programmable Signal Generator

2 layer board of 1.50 x 2.00 inches (38.1 x 50.8 mm)
Uploaded: May 28, 2018
Shared: June 14, 2018
Total Price: $15.00

This is a simple digital signal generator capable of generating a square wave from 1kHz to 68MHz with an accuracy of 1.1%. You enter the frequency on a numeric keypad, and the frequency is displayed on an I2C 128x32 OLED display.

See <http://www.technoblogy.com/show?26SM>.

This is a simple digital signal generator capable of generating a square wave from 1kHz to 68MHz with an accuracy of 1.1%. You enter the frequency on a numeric keypad, and the frequency is displayed on an I2C 128x32 OLED display.

See <http://www.technoblogy.com/show?26SM>.

Embeddable link to order this shared Project